First of all, congratulations! It doesn't sound to me like you've been doing "everything" wrong at all! First, I would say make sure your husband is 100% on board as well. There are lots of posts here about that. My 2 cents:
-Max out your pre-tax retirement accounts this year - 2014 is drawing to a close and some organizations might be nearing the contribution deadline for December 2014 already. I don't know what type of accounts each of you have access to, depending on employer (non profit, etc) or being self employed. Sorry for being vague but this is a realm I am not an expert in. But you are in a high tax bracket and your time is limited for doing that stuff this tax year.
-Living situation - when your lease is up, can you move closer to work, since hubby is working from home? What are the penalties for leaving your apartment earlier if the move is feasible, and would it make sense to break your lease now?
-Car - If you move closer to work, could you break your lease and turn the car back in? I don't know how leasing works but if it is cheaper in the long run, sometimes its worth eating the fees. If it isn't cheaper, and you move closer to work, would it be feasible to just garage it somewhere rather than driving it and minimize gas expense?
-Biking - I would say seriously consider the bike commute. I believe you when you say the roads are not conducive to safe cycling, but it is more than worth thinking about route options. I'm a recent convert to mustachianism myself and commuting by bike is my favorite part of the whole experience by far. I'm about 7 miles away and it takes me around 40 minutes to give you an idea of timing. You can't use the weather as an excuse ;)
-Side hustle - Not that you need it, but in the interest of constant optimization, do you guys have any other marketable skills or interests? This is also a great idea for putting yourself in the position of working at something you enjoy during retirement.
-Plan - Definitely sit down with your husband and define your goals and a plan to achieve those goals. You have a good start:
1. Buy home in Chicago in 6 years (How much will you have to spend?)
2. Retire in 6 years (What is your annual spending? Income during retirement? How much do you need invested to get your 4% withdrawal rate, or will you have rental properties, etc?)
3. Children? (in 6 years? or sooner, and if so, will you lose one income?)
You are in a great place to get answers, and my final piece of advice is to question every single line in your budget. Weigh the benefits/drawbacks of early termination of car lease, apt lease, etc. Welcome!